Refrigerator



FIG. 1 is a top plan view of a refrigerator according to my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines throughout the views are for environmental purposes and form no part of this invention. 

The ornamental design for a refrigerator, as shown and described. 